Btb87 just dropped some serious knowledge for it to be a Monday morning rambling.
But remember RainMan, when we seek out forgiveness, the bible tells use that once you have done all that you can to rectify the situation and the person does not respond, then you've done all you can you do - as btb87 said you've got to just leave it alone. Let God work on her - He doesn't need your assistance.
The best thing you can do for this woman is to pray for her.
But at the same time, work on yourself. DO NOT let this bad experience fester into bitterness in your heart towards black american women. You'll could very well EASILY miss out on your blessing.